Created structs and enums for alternate function UART pins

SHAL/Src/Peripheral/GPIO/SHAL_GPIO.cpp

@@ -55,7 +55,7 @@ void GPIO::setHigh() {
     static_cast<GPIO_TypeDef*>(gpioPeripheral.registers)->ODR |= (1 << gpioPeripheral.global_offset);
 }
 
-void GPIO::toggle() {
+void GPIO::toggle() volatile {
     auto gpioPeripheral = getGPIORegister(m_GPIO_KEY);
     static_cast<GPIO_TypeDef*>(gpioPeripheral.registers)->ODR ^= (1 << gpioPeripheral.global_offset);
 }

SHAL/Src/main.cpp

@@ -2,8 +2,8 @@
 #include "stm32f0xx.h"
 
 
-GPIO* blueLED = nullptr;
-GPIO* greenLED = nullptr;
+volatile GPIO* blueLED = nullptr;
+volatile GPIO* greenLED = nullptr;
 
 extern "C" void EXTI0_1_IRQHandler(void) {
     if (EXTI->PR & (1 << 0)) {   //Check pending flag